function debounce(fn, wait) {
    let timer = null
    return function () {
        let context = this, args = arguments
        clearTimeout(timer)
        timer = setTimeout(() => {
            fn.apply(context, args)
        }, wait)
    }
}

function throttle(fn, wait) {
    let timer = null
    return function () {
        let context = this, args = arguments
        if (!timer) {
            timer = setTimeout(() => {
                fn.apply(context, args)
                timer = null
            }, wait)
        }
    }
}
